President Obama used a visit to South Korea on Friday to make a push for immigration reform, saying "the value of our immigrants ... is central to who we are."

Obama took the opportunity at a naturalization ceremony for roughly two dozen people who were becoming U.S. citizens, to highlight why the immigration system needs to be overhauled.

“If there’s anything this should teach us, it is that America is strengthened by our immigrants,” Obama said at the National War Memorial, one stop on a weeklong visit to Asia. “What makes us Americans is something more than just the circumstances of birth, what we look like, what god we worship. Rather, it is a joyful spirit of citizenship.”

The president said this is one of the reasons it is time to reform the nation’s immigration system, since Americans need to “keep in mind the value of our immigrants to our way of life. It is central to who we are.”

Even as Obama runs into opposition from lawmakers on immigration, he predicted in February that the legislation would, in fact, pass Congress.

"I believe it will get done before my presidency is over," Obama said in an interview with Univision Radio. "I'd like to get it done this year."